Article useful as booster chair and as step stool



FIG. 1 is a perspective view of an article useful as a booster chair and as a step stool, as shown in a booster chair orientation;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof, one side being shown, the other side being a mirror image of the side shown;

FIG. 4 is a back elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom elevational view thereof;

FIG. 7 is a perspective view of the article in a step stool orientation, as seen from one vantage; and,

FIG. 8 is a perspective view of the article in the step stool orientation, as seen from another vantage. 

The ornamental design for an article useful as booster chair and as step stool, as shown and described. 